DD153911A1 - METHOD AND BURNER FOR PRODUCING A ROTATING CARBON FLAME - Google Patents

Abstract

The invention relates to the production of a rotating pulverized coal flame in highly cooled combustion chambers of industrial heat generating plants. The aim of the invention is to expand the field of application of solid fuels on industrial heat generating systems, which were previously reserved Heizoel and gas firing. The object is to provide a suitable method and a burner for highly cooled combustion chambers with the high reaction rates and thus short Ausbrandzeiten be achieved. The object is achieved by supplying air at ambient temperature to a combustion chamber through an axial coal-laden primary air flow and tangential secondary air flows. After ignition, the flame burns without support. It is advantageous that burners according to the invention are subsequently applied to small steam generators or the like. can be attached.

Description

225 1 A 2 -4-

Title of the invention

Method and burner for producing a rotating pulverized coal flame

Field of application of the invention

The invention "relates to a method and a burner for producing a rotating coal dust flame in highly cooled combustion chambers of industrial heat generation plants _f, preferably in small steam generators",.

, Characteristic of the known technical solutions

It is known to produce and maintain a ^; stable coal dust flame in narrow combustion chambers with short. Brennweg, which is synonymous with a short burning time to ensure the reaction temperature by Zündhilfen in the form of heated linings, bridges, shafts, Vorcchalteinrichtungen, etc. (eg BRD - OS 2? 35 519 ...) The disadvantages of the above methods and Facilities are that large combustion rooms bzv / _o expensive and wear-consuming Vorschalteinrichtungen and / or internals in the combustion chamber are required, the application especially at Flamraenrohr steam generators small power or not * only allow high costs.

On the other hand, burners and methods for producing rotating flames are well known for narrow and highly cooled combustion chambers, but these are operated only with gaseous and liquid fuels. "

Object of the invention

The invention has the goal Einpatzgebiet solid fuels to such industrial Wärmeerζeugungsanlagen, preferably flame-tube boilers which are so far the heating J> o oil and gas firing reserved to erv / fester, especially 'but Heiab'l and fuel gases in existing Heat generators to be replaced by dusty solid fuels »

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The essence of the invention

The object of the invention is to develop a method and a burner for the production of rotating coal dust flames with high reaction rates and small burn-out times for narrow and strongly cooled combustion chambers with the addition of a wide variety of fuel dusts.

According to the invention the object is achieved in that the. Combustion chamber combustion air at ambient temperature simultaneously supplied both by an axial, before entering the burner with fuel dust from any solid fuel, the moisture content "up to the limit of transportability and its grain size to coarse grain can be charged, primary air flow, as well as t _a ngentiale secondary air In this case, an inner circulation zone is formed and a short and uniform rotating flame of high radiation intensity is formed. The combustion is operated without auxiliary ignition except for the ignition initiation »and the heat output of the flame is changed by changing the velocity and / or combustion dust loading of the primary air combustion dust. Mixture controllable within wide limits «

The burner according to the invention consists of an inner tube without fittings for the Priinärluft-Brennstaub-Gemiseh and a, this tube enclosing annular channel with a taper and a spoiler for secondary air, which is followed by a diffuser to the combustion chamber * Am, annular channel is on the inflow side with a neck attached to a known throttle.

The diffuser has internals for tangential air flow at an acute angle to the exit plane <> It is also according to the invention that the burner insge. velvet with a mounting flange retrospectively on the combustion chamber, an existing steam generator instead of an oil or gas burner can be attached »

The burner is supplied via a pipe primary air-Brenrtstaub mixture and another line secondary air. The secondary air passes through the guiding devices of the

2 2 5

apparatus enters the combustion chamber tangentially at high speed and "causes a rotating flow with a pronounced inner recirculation zone, resulting in an intensive mixing of fuel and combustion air." This increases the reaction rate of combustion, thereby producing a compact rotary coal dust flame with high energy density and short burn times occur ·

The burner according to the invention is explained below using an exemplary embodiment according to the drawing:

Inside the burner is the pipe 1 for supplying the primary air-Brennstaub-G-emical, which is processed by means not shown in an air stream over the tube 1 surrounding annular channel 2, the secondary air is supplied through a taper 3 to the nozzle 4 · The secondary air tangentially emerging from the diffuser 4 passes through aen diffuser 5 into the combustion chamber »With the help of the throttle 6, the control of the secondary air flow * The pipe 1 is attached to the flange 8 on the annular channel 2. The entire burner is attached to the mounting flange 7 on the combustion chamber, a non-illustrated and known steam generator.

With the solution according to the invention, it is possible to use in industrial heat generation plants low power fuel dust in automated operation * It is of particular advantage that such YiTärmeerzeugungungsanlagen can be subsequently used by oil or fuel gas firing on fuel dust and thus set free high-quality energy sources and expensive imports omitted

Claims (1)

22 5U2 - * - claim 1·. A method for producing a rotating pulverized coal flame in preferably flame tube steam generators characterized in that a combustion chamber combustion air at ambient temperature simultaneously both by an axial primary air flow, which before entering a burner with fuel from any solid fuel with a. Moisture content can be loaded to the limit of transportability and a grain size to coarse grain as is fed by a tangentially directed secondary air, thereby forming a short and uniform rotating flame of high radiation intensity with inner recirculation zone * 2c The combustion takes place without auxiliary firing, whereby the heat output of the flame can be regulated by changing the velocity and / or the fuel dust loading of the primary air / fuel mixture 5 «coal dust burner for carrying out the method according to the points 1 u» 2 characterized in that the burner of an inner tube 1 without internals for a primary air-fuel mixture and this enclosing annular channel 2 with a taper 3 and an air guide 4 for secondary * be air is the to the combustion chamber, a diffuser 5 connects, and that on the annular channel 2 on the inlet side a nozzle with a known throttle 6 is attached · 4. pulverized coal burner according to points 2 and 3, characterized in that the spoiler 4 has internals for tangential air flow at an acute angle to the exit plane ¬ 5 «pulverized coal burner according to the points 3 and 4, characterized in that the burner ^{1 as} a whole with a Bsfestigungsflausch 7 at the combustion chamber, an existing steam generator can be attached *